Code Definition

P1125 — Throttle Control Motor Circuit

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Lexus

About P1125

P1125 is a manufacturer-specific powertrain diagnostic trouble code recorded for Lexus vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1125 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1125 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) operates the electronic throttle body by driving the throttle control motor, a small bidirectional DC motor that positions the throttle plate in response to driver demand. DTC P1125 is set when the ECM detects an electrical fault in the throttle control motor circuit, such as an open circuit, a short, or a driver stage fault that prevents proper current flow to the motor. The ECM drives the motor through an internal H bridge output stage and compares the commanded throttle angle against the throttle position sensor feedback. When this code sets the ECM disables ...

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